/* TaskFlow - Minimal Task Tracker CSS */

/* === CSS RESET & VARIABLES === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Light theme (same as Texty) */
    --color-bg-primary: #FCFCF9;
    --color-bg-secondary: #FCFCF9;
    --color-bg-tertiary: #f3f4f6;
    --color-text-primary: #111827;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;
    --color-text-inverse: #ffffff;
    --color-border: #e5e7eb;
    --color-border-focus: #000000;
    --color-primary: #000000;
    --color-success: #10b981;
    --color-danger: #ef4444;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;

    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;

    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark theme */
[data-theme="dark"] {
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #0f172a;
    --color-bg-tertiary: #1e293b;
    --color-text-primary: #f8fafc;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-text-inverse: #0f172a;
    --color-border: #334155;
    --color-border-focus: #ffffff;
    --color-primary: #ffffff;
    --color-success: #22c55e;
    --color-danger: #f87171;
}

/* === BASE STYLES === */
body {
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === LAYOUT === */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* === HEADER === */
.header {
    margin-bottom: var(--space-xl);
}

.header-content {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.app-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.search-container {
    flex: 1;
    min-width: 200px;
}

.search-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9375rem;
    font-family: var(--font-family);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
    transform: scale(1);
}

.search-input:hover {
    border-color: var(--color-text-muted);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-border-focus);
    background-color: var(--color-bg-primary);
    transform: scale(1.005);
    box-shadow: var(--shadow-sm);
}

.search-input::placeholder {
    color: var(--color-text-muted);
}

.theme-toggle {
    padding: var(--space-sm);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    transform: scale(1);
}

.theme-toggle:hover {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-border-focus);
    transform: scale(1.1) rotate(15deg);
}

.theme-toggle:active {
    transform: scale(0.9) rotate(15deg);
}

/* === MAIN CONTENT === */
.main-content {
    flex: 1;
}

/* === STATS BAR === */
.stats-bar {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-md);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.stat-item {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.stat-item span {
    font-weight: 600;
    color: var(--color-text-primary);
    margin-right: var(--space-xs);
}

.filter-buttons {
    margin-left: auto;
    display: flex;
    gap: var(--space-xs);
}

.filter-btn {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.875rem;
    font-family: var(--font-family);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.filter-btn:hover {
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
}

.filter-btn.active {
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    border-color: var(--color-border);
    font-weight: 500;
}

/* === ADD TASK === */
.add-task-container {
    margin-bottom: var(--space-lg);
}

.new-task-input {
    width: 100%;
    padding: var(--space-md);
    font-size: 1rem;
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
    transform: scale(1);
}

.new-task-input:hover {
    border-color: var(--color-text-muted);
}

.new-task-input:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: var(--shadow-md);
    transform: scale(1.005);
}

.new-task-input::placeholder {
    color: var(--color-text-muted);
}

/* === APP LAYOUT (TWO-COLUMN) === */
.app-layout {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

/* On mobile, stack vertically */
@media (max-width: 1024px) {
    .app-layout {
        grid-template-columns: 1fr;
    }

    .detail-panel {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        max-width: 400px;
        z-index: 1000;
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
    }
}

/* === TASK LIST === */
.task-list-container {
    margin-bottom: var(--space-xl);
}

.task-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.task-item {
    display: flex;
    align-items: stretch;
    gap: 0;
    padding: 0;
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast), box-shadow var(--transition), transform var(--transition-fast);
    animation: slideInLeft var(--transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    min-height: 52px;
    overflow: hidden;
    transform: scale(1);
}

.task-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-focus);
    background-color: var(--color-bg-tertiary);
    transform: scale(1.005) translateY(-1px);
}

.task-item:active {
    transform: scale(0.998);
    transition: transform 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

.task-item.completed {
    opacity: 0.5;
    transition: opacity var(--transition-slow);
}

.task-item.completed .task-text {
    text-decoration: line-through;
    color: var(--color-text-muted);
}

/* Left section with checkbox */
.task-checkbox-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--space-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.task-checkbox-wrapper:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

.task-checkbox-wrapper:active {
    transform: scale(0.95);
}

/* Main content area */
.task-content {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-sm);
    cursor: pointer;
}

/* Right section with badge and chevron */
.task-meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0 var(--space-md);
    background-color: transparent;
    transition: background-color var(--transition);
}

.task-item:hover .task-meta {
    background-color: rgba(0, 0, 0, 0.02);
}

/* Subtask count badge */
.subtask-count {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-tertiary);
    padding: 4px 10px;
    border-radius: 16px;
    font-weight: 600;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.task-item:hover .subtask-count {
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
}

/* Due date badge */
.task-due-date {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-tertiary);
    padding: 4px 10px;
    border-radius: 16px;
    font-weight: 600;
    letter-spacing: 0.02em;
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.task-item:hover .task-due-date {
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
}

/* Due today - highlight with primary color */
.task-due-date.today {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.task-item:hover .task-due-date.today {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    transform: scale(1.05);
}

/* Overdue - highlight with danger color */
.task-due-date.overdue {
    background-color: var(--color-danger);
    color: var(--color-text-inverse);
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.task-item:hover .task-due-date.overdue {
    background-color: var(--color-danger);
    color: var(--color-text-inverse);
    transform: scale(1.05);
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.8;
    }
}

/* Chevron indicator */
.task-chevron {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    opacity: 0.4;
    transition: all var(--transition);
}

.task-item:hover .task-chevron {
    opacity: 1;
    transform: translateX(2px);
}

/* === TASK CHECKBOX === */
.task-checkbox {
    width: 20px;
    height: 20px;
    min-width: 20px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    border: 2px solid var(--color-border);
    appearance: none;
    background-color: var(--color-bg-primary);
    position: relative;
    transition: all var(--transition-fast);
}

.task-checkbox:hover {
    border-color: var(--color-primary);
    transform: scale(1.1);
}

.task-checkbox:active {
    transform: scale(0.9);
}

.task-checkbox:checked {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    animation: checkboxPop var(--transition-fast) cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.task-checkbox:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(1);
    color: var(--color-text-inverse);
    font-size: 0.75rem;
    font-weight: 700;
    animation: checkmarkAppear 0.2s cubic-bezier(0.68, -0.55, 0.265, 1.55) 0.05s both;
}

@keyframes checkboxPop {
    0% { transform: scale(1); }
    50% { transform: scale(0.9); }
    100% { transform: scale(1); }
}

@keyframes checkmarkAppear {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

/* === TASK TEXT === */
.task-text {
    flex: 1;
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--color-text-primary);
    background: transparent;
    border: none;
    outline: none;
    padding: 0;
    word-wrap: break-word;
    word-break: break-word;
    min-height: 1.5rem;
    user-select: text;
}

.task-text:empty::before {
    content: attr(data-placeholder);
    color: var(--color-text-muted);
}

/* Make task items clickable */
.task-item {
    cursor: pointer;
    user-select: none;
}

.task-item.selected {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

/* === DETAIL PANEL === */
.detail-panel {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 0;
    height: fit-content;
    max-height: calc(100vh - 200px);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: var(--space-lg);
    box-shadow: var(--shadow-lg);
    animation: detailPanelSlideIn var(--transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes detailPanelSlideIn {
    0% {
        opacity: 0;
        transform: translateX(20px) scale(0.98);
    }
    100% {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg-tertiary);
}

.detail-header h2 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    margin: 0;
}

.close-detail-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 1.25rem;
    line-height: 1;
    cursor: pointer;
    transition: all var(--transition-fast);
    transform: scale(1);
}

.close-detail-btn:hover {
    background-color: var(--color-bg-primary);
    border-color: var(--color-border-focus);
    color: var(--color-text-primary);
    transform: scale(1.1) rotate(90deg);
}

.close-detail-btn:active {
    transform: scale(0.9) rotate(90deg);
}

.detail-content {
    display: flex;
    flex-direction: column;
    gap: 0;
    overflow-y: auto;
    flex: 1;
}

.detail-task {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg-primary);
}

.detail-task-text {
    flex: 1;
    font-size: 1.0625rem;
    font-weight: 500;
    line-height: 1.5;
    color: var(--color-text-primary);
    background: transparent;
    border: none;
    outline: none;
    padding: var(--space-xs) 0;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    word-wrap: break-word;
    word-break: break-word;
    min-height: 1.5rem;
}

.detail-task-text:focus {
    background-color: transparent;
}

.detail-task-text:empty::before {
    content: 'Task name...';
    color: var(--color-text-muted);
}

.detail-subtasks {
    padding: var(--space-lg);
    background-color: var(--color-bg-secondary);
}

.subtasks-heading {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.add-subtask-container {
    margin-bottom: var(--space-md);
}

.new-subtask-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
    transform: scale(1);
}

.new-subtask-input:hover {
    border-color: var(--color-text-muted);
}

.new-subtask-input:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
    transform: scale(1.005);
}

.new-subtask-input::placeholder {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.subtask-list {
    display: flex;
    flex-direction: column;
    gap: 1px;
    background-color: var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.subtask-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-bg-primary);
    transition: all var(--transition-fast);
    min-height: 42px;
    transform: scale(1);
}

.subtask-item:hover {
    background-color: var(--color-bg-tertiary);
    transform: scale(1.005) translateX(2px);
}

.subtask-item.completed {
    opacity: 0.5;
}

.subtask-item.completed .subtask-text {
    text-decoration: line-through;
    color: var(--color-text-muted);
}

.subtask-text {
    flex: 1;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--color-text-primary);
}

.subtask-delete {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 1.125rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
    transform: scale(0.8);
}

.subtask-item:hover .subtask-delete {
    opacity: 1;
    transform: scale(1);
}

.subtask-delete:hover {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--color-danger);
    transform: scale(1.15);
}

.subtask-delete:active {
    transform: scale(0.9);
}

.empty-subtask-state {
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    color: var(--color-text-muted);
    font-size: 0.8125rem;
    background-color: var(--color-bg-primary);
    border-radius: var(--radius-md);
}

.delete-task-btn {
    margin: var(--space-lg);
    padding: var(--space-md);
    background-color: transparent;
    border: 1px solid var(--color-danger);
    border-radius: var(--radius-md);
    color: var(--color-danger);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    transform: scale(1);
}

.delete-task-btn:hover {
    background-color: var(--color-danger);
    color: var(--color-text-inverse);
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-md);
}

.delete-task-btn:active {
    transform: translateY(0) scale(0.98);
    box-shadow: var(--shadow-sm);
}

/* === EMPTY STATE === */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl) var(--space-lg);
    text-align: center;
    color: var(--color-text-muted);
}

.empty-state svg {
    margin-bottom: var(--space-lg);
    opacity: 0.5;
}

.empty-state h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.empty-state p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

/* === BULK ACTIONS === */
.bulk-actions {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-md);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
}

/* === BUTTONS === */
.btn {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.9375rem;
    font-family: var(--font-family);
    font-weight: 500;
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    transform: scale(1);
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0) scale(0.98);
    box-shadow: var(--shadow-sm);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-outline:hover {
    background-color: var(--color-bg-primary);
    border-color: var(--color-border-focus);
    transform: translateY(-2px) scale(1.02);
}

.btn-outline:active {
    transform: translateY(0) scale(0.98);
}

/* === FOOTER === */
.footer {
    margin-top: auto;
    padding-top: var(--space-xl);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.footer kbd {
    padding: 2px 6px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
}

/* === TOAST === */
.toast {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    font-size: 0.9375rem;
    font-weight: 500;
    z-index: 1000;
    transform: translateY(100px) scale(0.9);
    opacity: 0;
    transition: all var(--transition-slow);
    pointer-events: none;
}

.toast.show {
    transform: translateY(0) scale(1);
    opacity: 1;
    pointer-events: auto;
    animation: toastBounceIn 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes toastBounceIn {
    0% {
        transform: translateY(100px) scale(0.9);
        opacity: 0;
    }
    60% {
        transform: translateY(-5px) scale(1.02);
        opacity: 1;
    }
    100% {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

/* === ANIMATIONS === */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(20px);
    }
}

/* === RESPONSIVE === */
@media (max-width: 640px) {
    .container {
        padding: var(--space-md);
    }

    .header-content {
        flex-direction: column;
        align-items: stretch;
    }

    .app-title {
        font-size: 1.5rem;
    }

    .stats-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-buttons {
        margin-left: 0;
        width: 100%;
    }

    .filter-btn {
        flex: 1;
    }

    .task-item {
        padding: var(--space-sm) var(--space-md);
    }

    .task-delete {
        opacity: 1;
    }

    .toast {
        left: var(--space-md);
        right: var(--space-md);
    }
}

/* === PRINT STYLES === */
@media print {
    .header,
    .stats-bar,
    .add-task-container,
    .bulk-actions,
    .footer,
    .theme-toggle,
    .task-delete {
        display: none;
    }

    .task-checkbox {
        appearance: checkbox;
    }
}